[jfx11u] RFR: 8301010: Change JavaFX release version to 11.0.19 in jfx11u

[Johan Vos]

Bump release version to 11.0.19 in build.properties and .jcheck/conf
Fix for JDK-8301010

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Commit messages:
 - Increase release version for JavaFX 11.0.19

Changes: https://git.openjdk.org/jfx11u/pull/125/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx11u&pr=125&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301010
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx11u/pull/125.diff
  Fetch: git fetch https://git.openjdk.org/jfx11u pull/125/head:pull/125

PR: https://git.openjdk.org/jfx11u/pull/125